Analysis by: Jaime Benigno Reyes
ALIASES:

Trojan:JS/BlacoleRef.CT (Microsoft), JS/Exploit-Blacole.gg !! (McAfee), Trojan.Webkit!html (Symantec)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be hosted on a website and run when a user accesses the said website.

Once a compromised site is visited, the user is redirected to a certain malicious site. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 1,007 bytes
File Type: JS
Initial Samples Received Date: 19 Nov 2012

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be hosted on a website and run when a user accesses the said website.

Other Details

Once a compromised site is visited, the user is redirected to the following malicious site:

  • http://{BLOCKED}aono.ru:8080/forum/links/column.php

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.536.03
FIRST VSAPI PATTERN DATE: 19 Nov 2012
VSAPI OPR PATTERN File: 9.537.00
VSAPI OPR PATTERN Date: 20 Nov 2012

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_BLACOLEREF.GL. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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